16406405 has 16 divisors (see below), whose sum is σ = 20824320. Its totient is φ = 12374208.

The previous prime is 16406393. The next prime is 16406407. The reversal of 16406405 is 50460461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16406405 - 2⁴ = 16406389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16406407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35204 + ... + 35666.

It is an arithmetic number, because the mean of its divisors is an integer number (1301520).

Almost surely, 2^16406405 is an apocalyptic number.

It is an amenable number.

16406405 is a deficient number, since it is larger than the sum of its proper divisors (4417915).

16406405 is a wasteful number, since it uses less digits than its factorization.

16406405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 16406405 is about 4050.4820700751. The cubic root of 16406405 is about 254.0998894117.

Adding to 16406405 its reverse (50460461), we get a palindrome (66866866).

The spelling of 16406405 in words is "sixteen million, four hundred six thousand, four hundred five".